Bolting apparatus for flour-mills



- 2 Sheets-Sheet 1. L. GATHMANN.

Belting Apparatus for Flour-Mill s. No. 228,751. Patented June 15,1880.

c 3 KlZS R UNITED STATES.

PATENT OFFICE.

LOUIS GATHMANN, 0 F GHIGAGO, ILLINOIS.

BOLTING APPARATUS FOR FLOUR-MlLLS.

SPECIFICATION forming part of Letters Patent No. 228,751, dated June 15, 1880.

Application filed February 25, 1880.

To all whom it may concern Be it known that I, LoU1s GATHMANN, of Chicago, State of Illinois, have invented cer-' tain new and useful Improvements in Belting or Separating Apparatus for Flour-Mills; and I do hereby declare that the following is a'full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to bolting or separat ing apparatus for fiouring-mills; and it con sists in the combination hereinafter specified, with the screens or bolts of a purifier having an air-blast, of a dust-collector arranged within the machine and in the air-passage thereof, so as to intercept the air-current after it has passed the screens, substantially as herein described.

In the drawings, Figures 1 and 2 are side elevations of a purifier containing both my improvements. Fig. 3 is a central vertical longitudinal section of the same. Fig. 4 is a transverse vertical section of the machine through the line y y of Fig. 3. Fig. 5 is a detail view, showing part'of the mechanism whereby the dust-cloth is actuated. Fig. 6 is a top view of one of the bolting-screens of the purifier, and Fig. 7 is an under-side view of the coarse net ting and its frame by which the bolting-cloth is cleaned. I p

The general features and construction of the purifier are not new, and being familiar to those skilled in the art need not be here particularly described.

A and B respectively represent the framework and inclosing sides of the machine. S is the vibrating shoe, carrying the screens and the various conveying-boards, and actuated through the rod 0 from an eccentric on the shaft of the suction-fan- F. The usual openings and passages are provided for the material to be operated upon and for the air.

The devices for clearing the meshes of the bolts and screens will be first described.

In the drawings, h h represent the several screen-cloths, mounted in the usual manner on inclined frames f within the shoe S.

Within the opening of each of the screenframes f, and beneath the bolting-cloth thereof, is placed the frame f, shorter than said openingin the direction of movement of the screen and clothed with coarse or open netting on its upper surface. The frames are intendedto be lifted at brief intervals, so as to bring the net ting into momentary contact with the under surface of the bolts h, for the purpose of clearing their meshes by a rubbing action of one upon the other. Provision is made for their support parallel with the bolting-cloths h, and, say, half an inch therefrom, by the transverse bars 1; p. The'screens being movable in their planes, it is desirable that the cleaners should be stationary in this direction; wherefore, the bars p are fixed to the sides B of the purifier, and slots 8 are provided in the sides of the moving shoe for their passage.

Each cleaner is lifted by means of an arm, m, and in order to secure even bearing of the cleaner against the bolting-cloth, said arm m bears upward against the middle of a central rail, 2 of the cleaner-framej". This central rail is notched at a to receive the arm m, in order that the cleaner may be held horizontally stationary by said arm while in contact with the reciprocating bolt h.

The arms for the several cleaners are pivoted to the rail 1, fixed to the casing B, and pass through slots 8 in the side of the shoe.

The arms at are also pivotally connected to the movable vertical bar J. This bar is worked by the lever K and pulley L, the latter having the pin to, arranged to strike the lever K at each revolution, as clearly shown in Fig. 2. The cleaners, bearing on the long arms m, fall by their own weight.

To insure more even pressure of the cleaners upon the bolts h, the rails gare secured to the bolt-frames above the bolting-cloth and in contact therewith, as shown in the several Figs. 3, 4, and 6.

The arms at are preferably of wood, and formed,as indicated, to spring, and thus to press yieldingly upward against the cleaners, that the frictional contact of the latter with the bolts may not be too'sevcre.

The cleaner may, if desired, be given an independent movement parallel with the screens.

A special advantage of a cleaner of netting is found in the fact that it does not appreciably obstruct the passage of the air upward through the bolt or screen while the latter is being acted upon thereby. The movement by which the cleaners are brought into contact with the bolts may be varied to give any required frequency or duration of contact. Once a minute will ordinarily be sufficient to insure perfect action of the bolts, the actual contact of the cleaners with the bolts being very brief.

The devices for collecting the dust and impurities will be next described.

Between the shoe S and the fan F of a suction-purifier, or next beyond the screens in the direction of the air-current, is placed the dustsereen D, consisting of a loosely-woven sheet, 0,- of flannel or other similar material drawn taut, and supported in the inclined position shown in Fig. 3 upon the frame E. This frame has the central rail, E, and fills the space between the walls of the chamber in which it is placed. In the operation of the machine the air from the screens passes through this cloth and deposits its burden of dust and impurities thereon.

It is obvious that in the inclined position of the dust-collecting cloth, as shown, a sudden and frequent jarring thereof will detach the dust thereon accumulated, and that the detached dust, after, perhaps, repeatedly being again drawn to the cloth at lower points, will ultimately fall beyond the range of the air-current, and will settle in quiet mass at the bottom of the chamber, whence it may be removed by any suitable carrier or conveyer.

For the purpose of jarring the cloth to detach the impurities intercepted, a knockcr is provided, consisting of the lever B, pivoted to the marginal rail of the frame E, and arranged tostrike the central rail, E, against which the cloth rests. This lever B is actuated to strike the frame by a spring, P, applied as shown, or in any other suitable manner, and is lifted by means of the external cam-pulley, P, pivoted to engage the protruding end of the lever B by the cam c. The blow of the striker is thus calculated to throw the impurities detached thereby against the air-current, so that in fact they are allowed to fall a considerable distance before being again drawn by the constant current to the cloth.

For the purpose of distributing the jarring effect more perfectly over the entire area of the cloth, as well as for the better support of the latter, a coarse netting of wire, w, is secured over the aperture of the frame E beneath the dust-cloth. This feature of the collector, however, is not of my invention.

Instead of a knocker arranged to strike the collector-frame E, the entire frame may be made movable and be directly vibrated through a projecting arm, R, rigidly secured thereto, or otherwise, as may be found most effective or convenient; or a series of wings, each bearing a suitable cloth, may be arranged to rotate successively into and out of the current in such manner as that the passage of thelatter shall always be intercepted by some one or more of them, and as they fall out of the current they may be struck in the manner described to dislodge the dust deposited thereon.

Having thus' described my invention, I claim 1. An air-blast separator provided with a dust-arrcster, arranged in a vertical, or nearly vertical, position, to intercept the horizontal air-current, and combined with mechanism for detaching the dust, and with a space at its foot, outside the range of the current, to receive the dust, substantially as described.

2. The dust-arrester D, arranged within a purifier, to intercept the air-current in its passage from the screens, the lever It, the spring P, and the cam-pulley P, combined and operating substantially as and for the purposes described.

In testimony that I claim the foregoing as my invention I affix my signature in presence of two witnesses.

LOUIS GATH MAN N.

Witnesses:

M. E. DAYTON, 7 WILLIAM M. STANLEY. 

